Unit 6 Test Review

What does tRNA do?

• bring amino acids to the ribosome

• makes up part of the ribosome

• transcribes DNA

• all are correct

What is the function of mRNA?

• transfers genetic information in DNA to a ribosome

• makes up the ribosome

• brings amino acids to the ribosome

• translate the information from the nitrogen bases to amino acids

A single-stranded nucleic acid that is a copy of a specific DNA sequence

• tRNA

• rRNA

• mRNA

• dRNA

Some amino acids are encoded by more than one codon

• True

• False

Which type of mutation involves the replacement of one base pair in DNA?

• Insertion

• Deletion

• Substitution

• Duplication

Tags

NGSS.HS-LS3-2

A frameshift mutation occurs when nucleotides are added or deleted from the DNA sequence, causing a shift in the reading frame of the codons.

• True

• False

Tags

NGSS.HS-LS3-2

Mutations can be classified based on their effects on an organism. Which of the following best describes the potential impact of mutations?

• Mutations are always beneficial

• Mutations are always harmful

• Mutations can be beneficial, harmful, or neutral

• Mutations have no impact on an organism

How do mutations in somatic cells affect an organism?

• They can lead to genetic changes that are passed onto the next generation.
  

• They can cause diseases such as cancer but are not inherited by offspring

• They have no impact on the organism.

•  They can only affect the germ cells and not somatic cells.

What is gene expression?

• The process of DNA replication

  
  

• The process by which information from a gene is used to synthesize a functional gene product when turned on

• The process of cell division

• The process of cell degradation

Which of the following can affect gene expression?

• Chemical exposure

• Light

• Temperature

• all are correct